Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37ffef766b2a47d…

MALICIOUS

PDF

78.3 KB Created: 2021-08-09 13:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 497a41983d802552ee95324d337de0c2 SHA-1: f81997d234284a52077091f60993129c1c769168 SHA-256: d37ffef766b2a47d6eae2f5baef531bcab785b1dbf23f101a45df07e76248db6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to facilitate the download of a second-stage payload. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/2bdd9794fdb419f0d4034c01e3136124/sosukigebolazusigivudegal.pdf In PDF document text
    • https://stancijanegrin.com/UserFiles/files/56003338806.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/takizawazukupul.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hl1ukgjt8vr33rp9uubhued2lm/jeberenitazanitiduve.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/150308533485.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2cbc71122834b3911c5427ff1bf6ffb0/48069266809.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/vomalatim.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4fe524d46ca75c99cd3664c7b501f978/91515753231.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/tivurevix.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d53d5634e---dugovigus.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d44907210d749fa69b7bf07db0aa16b2/rutusajodilez.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/365j8ectecdbseg2g1eu69nuqn/57282680649.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n7c6eaijns7v3ua1i7sovblshj/danuwixofogevibogu.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/ketomonogokijegizevi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jgo9rlgfj5b3emjj17s4b1e43p/90827834810.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/padufigigovovabep.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2feecbb53e---47490138302.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/25001950295.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5dd08495fcd4b8566aa84535a04492a2/72583754550.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25e01bd439---nugara.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a62263831c---9900300162.pdfIn PDF document text
    • http://jaatkinson.com/userimages/33712730638.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/biwonufolupopoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=redex+job+circular+in+bangladesh+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 16548 bytes
SHA-256: 1a0c3fbc72df66c976eaa95f4dbb2a9432bc6785b6c490242ee2132ff299c302
font_01_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 11308 bytes
SHA-256: 91b8e4260bc7eb1ee4d73922ad210cf6bc7e92838be10a00330467e04d1f6ded
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1